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Vernon Davis (85) of the San Francisco 49ers warms up during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Colin Kaepernick (7) of the San Francisco 49ers jokes around as he heads onto the field for practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Austin Collie (6) of the San Francisco 49ers stretches before practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Lavelle Hawkins (4) and Austin Collie (6), from left, of the San Francisco 49ers stretch before practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Lavelle Hawkins (4) of the San Francisco 49ers stretches before practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

A street sign marks a path out to the practice field at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Members of the San Francisco 49ers stretch during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Marcus Cooper (33) of the San Francisco 49ers warms up during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Members of the San Francisco 49ers warm up during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Glenn Dorsey (90) of the San Francisco 49ers runs a drill during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Colin Kaepernick (7) of the San Francisco 49ers throws a pass as teammate Colt McCoy (2) looks on during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Frank Gore (21) of the San Francisco 49ers runs a drill during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Colin Kaepernick (7) of the San Francisco 49ers throws a pass during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Lavelle Hawkins (4) of the San Francisco 49ers catches a pass during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Austin Collie (6) of the San Francisco 49ers catches a pass during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Kyle Williams (10) of the San Francisco 49ers stretches during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. Williams continues to deal with a right hamstring issue. (Anda Chu/Bay Area News Group)

NFL referees watch the San Francisco 49ers during their practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Colin Kaepernick (7) of the San Francisco 49ers, center, and teammates walk across the field during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

Colin Kaepernick (7) of the San Francisco 49ers drops back to pass during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

San Francisco 49ers head coach Jim Harbaugh, far right, keeps an eye on his players during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)

San Francisco 49ers head coach Jim Harbaugh shouts instructions to his players during practice at the team's training camp in Santa Clara, Calif., on Friday, Aug. 2, 2013. (Anda Chu/Bay Area News Group)